Sometimes the site which is hosted by godaddy will get an error like this:
“Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.”
In fact this isn’t a proper description about above error.Most webservers don’t die out, Apache can take quite a beating. What generally is the problem. Usually we can’t fix it because that was produced often relates to the number of concurrent connections on your hosting account at 1 time.For the Economy, Deluxe, and Premium hosting plan only 50, 100, and 150 connections can occur at a time respectively. To correct this, you will want to look into your closeout script in the page where the error is occurring. It is important to check that when people are leaving the page, they are also being disconnected from the site.
Another cause of this error maybe your site is using too much CPU,but unfortunately Godaddy doesn’t public the detail about the limit of CPU usage.